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CN110007166B - A Fast Measurement Method of Inverter Energy Efficiency - Google Patents

A Fast Measurement Method of Inverter Energy Efficiency Download PDF

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CN110007166B
CN110007166B CN201910232844.1A CN201910232844A CN110007166B CN 110007166 B CN110007166 B CN 110007166B CN 201910232844 A CN201910232844 A CN 201910232844A CN 110007166 B CN110007166 B CN 110007166B
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CN110007166A (en
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朱明星
江挺
高敏
何伟
孙旻
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State Grid Corp of China SGCC
Anhui University
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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Anhui University
Electric Power Research Institute of State Grid Jiangxi Electric Power Co Ltd
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Abstract

本发明公开了一种变频器能效的快速测量方法，首先在待测变频器的输入、输出端口进行电压电流信号的采集；利用数据采集卡对电压信号和电流信号进行采样，获得采样的电压、电流信号；将采样的电压、电流信号对应点相乘，得到单个点对应的输入、输出功率；根据单个点的输入、输出功率获得Y个周期内的输入、输出功率；根据输入、输出功率求得变频器的时域能效，并将电压电流信号进行DFT变换，计算得到变频器的频域能效；然后基于某一设定时间节点下对应的时域能效和频域能效值，获得待测变频器的能效。该方法可以对变频器能效进行准确计算，对变频器能效的评估和变频器的选用提供了参考。

Figure 201910232844

The invention discloses a fast measuring method for the energy efficiency of a frequency converter. First, the voltage and current signals are collected at the input and output ports of the frequency converter to be tested; the voltage and current signals are sampled by a data acquisition card to obtain the sampled voltage, Current signal; multiply the corresponding points of the sampled voltage and current signals to obtain the input and output power corresponding to a single point; obtain the input and output power in Y cycles according to the input and output power of a single point; Obtain the time-domain energy efficiency of the inverter, and perform DFT transformation on the voltage and current signals to calculate the frequency-domain energy efficiency of the inverter; energy efficiency of the device. This method can accurately calculate the energy efficiency of the inverter, and provides a reference for the evaluation of the energy efficiency of the inverter and the selection of the inverter.

Figure 201910232844

Description

Method for rapidly measuring energy efficiency of frequency converter
Technical Field
The invention relates to the technical field of electrical measurement, in particular to a method for quickly measuring energy efficiency of a frequency converter.
Background
The variable frequency speed control technology is deeply used as a main means for saving energy, reducing consumption, improving process flow, improving product quality and environment and promoting technical progress. Currently, in the field of low voltage (380V-690V), the AC variable frequency speed regulation technology has been widely applied, and in the field of medium and high voltage (3kV, 6kV and 10kV voltage levels), the application has not been widely developed due to the influence of restriction factors of high voltage power electronic devices. The body loss of the frequency converter mainly comprises loss of devices in the working process, the loss comprises four parts of off-state loss (caused by leakage current), on-state loss and on-off loss, and meanwhile, the on-state and on-off characteristics of the power devices are very sensitive to temperature. Due to the skin effect, the losses of the frequency converter are different at different subharmonics. It has been shown through previous studies that the current flowing through an Insulated Gate Bipolar Transistor (IGBT), the voltage of the IGBT emitter, is considered to be a major factor affecting the body loss of the device. In a certain sense, the size of the body loss of the frequency converter is also a standard for measuring the cost performance of the frequency converter, so that the measurement of the energy efficiency of the frequency converter is particularly important.
Most of methods for measuring the energy efficiency of the frequency converter in the prior art are time domain methods, namely sampling time is a common multiple of input and output signal periods, and input and output power is calculated in an integer cycle to obtain the energy efficiency of the frequency converter. However, according to different industrial field electric devices, the signal frequency at the output end of the frequency converter is different according to the operation requirements of the devices, the operation frequency required by one device may also be changed, and the input end and the output end of the frequency converter have different frequencies, so that the periods of the frequency converter are different, which brings great difficulty to the measurement of the energy efficiency of the frequency converter.
Disclosure of Invention
The invention aims to provide a method for quickly measuring the energy efficiency of a frequency converter, which can accurately calculate the energy efficiency of the frequency converter and provides reference for evaluation of the energy efficiency of the frequency converter and selection of the frequency converter.
The purpose of the invention is realized by the following technical scheme:
a method for rapidly measuring energy efficiency of a frequency converter, comprising the following steps:
step 1, collecting voltage and current signals at an input port and an output port of a frequency converter to be tested to obtain a voltage signal U and a current signal I;
step 2, sampling a voltage signal U and a current signal I by using a data acquisition card, sampling N points of input end signals per cycle, and intercepting output end signals for t time length to obtain corresponding sampling voltage and current signals U (N) and I (N);
step 3, multiplying the obtained sampling voltage and current signals U (n) and I (n) corresponding points to obtain input power and output power corresponding to a single point, and respectively marking as Pin(n) and Pout(n)；
Step 4, according to the input and output power P of a single pointin(n) and Pout(n) obtaining input and output power over Y cycles, expressed as:
Figure BDA0002007259740000021
step 5, obtaining the input and output power P according to the step 4inAnd PoutThe time domain energy efficiency of the frequency converter is obtained as follows:
Figure BDA0002007259740000022
step 6, processing the sampled voltage and current signals U (n) and I (n) by using Discrete Fourier Transform (DFT) to obtain fundamental wave and each subharmonic voltage, frequency domain components U (k) and I (k) of the current signals and a phase difference theta (k);
where k (k ═ 1,2,3, …) is the harmonic order, the frequency domain input power of the frequency converter is:
Figure BDA0002007259740000023
step 7, obtaining the frequency domain output power P of the frequency converter in the same wayout', and obtaining the variables according to the formula of step 5Recording the values of time domain energy efficiency eta and frequency domain energy efficiency eta' of the frequency device, taking Y as Y +1 periods, and repeating the steps 3-7;
and 8, acquiring the energy efficiency of the frequency converter to be tested based on the corresponding time domain energy efficiency and frequency domain energy efficiency values under a certain set time node.
According to the technical scheme provided by the invention, the method can accurately calculate the energy efficiency of the frequency converter, provides reference for the evaluation of the energy efficiency of the frequency converter and the selection of the frequency converter, and provides reference for the energy efficiency measurement of other power equipment.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for rapidly measuring energy efficiency of a frequency converter according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating the relationship between the error function and the number of input signal cycles e (Y) -Y according to an exemplary embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention are clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without making any creative effort, shall fall within the protection scope of the present invention.
The following will describe an embodiment of the present invention in further detail with reference to the accompanying drawings, and as shown in fig. 1, a schematic flow chart of a method for rapidly measuring energy efficiency of a frequency converter provided by the embodiment of the present invention is shown, where the method includes:
step 1, collecting voltage and current signals at an input port and an output port of a frequency converter to be tested to obtain a voltage signal U and a current signal I;
step 2, sampling a voltage signal U and a current signal I by using a data acquisition card, sampling N points of input end signals per cycle, and intercepting output end signals for t time length to obtain corresponding sampling voltage and current signals U (N) and I (N);
in this step, because the frequency of the input end signal (with the period of T) is determined, the input end signal of the frequency converter to be tested is truncated in a whole period, the number of periods is taken as Y (Y is 1,2,3 …), and the length of the corresponding time window is T;
the method comprises the steps of sampling a voltage signal U and a current signal I by a data acquisition card, converting an analog quantity into a digital quantity, sampling N points of input end signals per cycle, intercepting output end signals for t time length, and obtaining corresponding voltage and current signals U (N) and I (N), wherein N (N is 1,2,3 and …) is a sampling point, and the cycle number Y is 1.
Step 3, multiplying the obtained sampling voltage and current signals U (n) and I (n) corresponding points to obtain input power and output power corresponding to a single point, and respectively marking as Pin(n) and Pout(n)；
Step 4, according to the input and output power P of a single pointin(n) and Pout(n) obtaining input and output power over Y cycles, expressed as:
Figure BDA0002007259740000031
step 5, obtaining the input and output power P according to the step 4inAnd PoutThe time domain energy efficiency of the frequency converter is obtained as follows:
Figure BDA0002007259740000032
step 6, processing the sampled voltage and current signals U (n) and I (n) by using Discrete Fourier Transform (DFT) to obtain fundamental wave and each subharmonic voltage, frequency domain components U (k) and I (k) of the current signals and a phase difference theta (k);
where k (k ═ 1,2,3, …) is the harmonic order, the frequency domain input power of the frequency converter is:
Figure BDA0002007259740000041
in a specific implementation, the frequency domain components u (k), i (k) of the obtained voltage and current signals are represented as:
Figure BDA0002007259740000042
step 7, obtaining the frequency domain output power P of the frequency converter in the same wayout' and obtaining the frequency domain energy efficiency eta ' of the frequency converter according to the formula in the step 5, recording the values of the time domain energy efficiency eta and the frequency domain energy efficiency eta ', then taking Y as Y +1 periods, and repeating the steps 3-7;
and 8, acquiring the energy efficiency of the frequency converter to be tested based on the corresponding time domain energy efficiency and frequency domain energy efficiency values under a certain set time node.
The process of the step specifically comprises the following steps:
firstly, establishing an error function e (Y) | eta-eta' | and an error threshold epsilon (epsilon can be determined according to an actual measurement result and is close to zero), wherein Y is the number of signal cycles of an input end;
obtaining a relation graph of the error function and the input end signal period number E (Y) -Y, and marking a minimum value point smaller than an error threshold value epsilon as Ej(j＝1,2,3,… )；
To ensure the accuracy and rapidity of the calculation, take E2And the average value of the corresponding time domain energy efficiency and the corresponding frequency domain energy efficiency under the time node is the energy efficiency of the frequency converter to be tested.
In addition, if E can not be found in the E (Y) -Y relation diagram2The time node can properly extend the length t of the sampling time window and recalculate.
The following describes the above measurement method in detail by using specific examples, and the numerical values used in the following examples are only examples, and the user can make corresponding changes according to actual requirements. In the example, the power supply voltage of certain industrial equipment is 10kV/50Hz, the power voltage of the equipment is 400V, the frequency is unknown, and the frequency conversion equipment adopts an uncontrollable diode rectifying circuit and reaches an IGBT trigger control inverter circuit through a filter capacitor. When the equipment normally works, voltage and current signals are respectively collected at the input end and the output end of the frequency converter, 256 points are sampled at each cycle of the input end signal, the electric quantity of the time domain and the frequency domain of the frequency converter is calculated, the energy efficiency of the frequency converter and the frequency domain is calculated and compared, when the energy efficiency difference of the time domain and the frequency domain is minimum, the energy efficiency of the frequency converter is the average value of the energy efficiency of the time domain and the frequency domain, and the specific implementation steps are as follows:
(1) the signal collector is correctly arranged at the input end and the output end of the frequency converter, and the voltage and current signals are measured under the condition that the equipment works normally, wherein the measuring time is 5 minutes;
(2) performing whole-cycle truncation on the input end voltage current signal in the step (1), wherein the length of a time window is 1s, namely the cycle number Y is 50, and the sampling N per cycle is 256 points, so as to obtain a discrete sequence;
(3) taking the input end signal period Y as 1, multiplying the corresponding points of the discrete voltage and current signals to obtain the corresponding instantaneous power P of a single pointin(n) and Pout(n) determining total input and output power P in Y periodsinAnd PoutAnd then calculating the total input and output electric quantity and the energy efficiency in the time domain of the frequency converter:
Figure BDA0002007259740000051
(4) DFT conversion is carried out on the discrete sequence in the step (3) to obtain frequency domain components of the discrete sequence, amplitude values (U (k) and I (k)) and phase differences (theta (k)) of fundamental wave voltage and each subharmonic voltage and current signals are obtained, active power P of the fundamental wave and each subharmonic is calculatedin(k) And Pout(k) Calculating the total input and output power P of the frequency converterin' and PoutAnd calculating the total input and output electric quantity and energy efficiency in the frequency domain of the frequency converter:
Figure BDA0002007259740000052
(5) recording the values of η and η', taking the period Y of the input end signal as Y +1, repeating steps (3) and (4), and drawing a graph of the relationship between the error function and the period e (Y) -Y of the input end signal, as shown in fig. 2, which is a graph of the relationship between the error function and the period e (Y) -Y of the input end signal in the example of the present invention, with reference to fig. 2: defining epsilon to be 0.1% according to actual measurement results, and taking a minimum value point smaller than epsilon as Ej(j＝1,2,3, … )。
(6) Then determining a time node E according to the step (5)2The corresponding period Y is 46, and the energy efficiency of the frequency converter is equal to 46 without considering rounding errors
Figure BDA0002007259740000053
It is noted that those skilled in the art will recognize that embodiments of the present invention are not described in detail herein.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.

Claims (5)

1.一种变频器能效的快速测量方法，其特征在于，所述方法包括：1. a fast measuring method of frequency converter energy efficiency, is characterized in that, described method comprises: 步骤1、在待测变频器的输入、输出端口进行电压电流信号的采集，得到电压信号U和电流信号I；Step 1. Collect the voltage and current signals at the input and output ports of the frequency converter to be tested, and obtain the voltage signal U and the current signal I; 步骤2、利用数据采集卡对电压信号U和电流信号I进行采样，对输入端信号每周波采样N个点，对输出端信号也进行t时间长度的截取，获得对应的采样电压、电流信号U(n)和I(n)；Step 2. Use the data acquisition card to sample the voltage signal U and the current signal I, sample N points per cycle for the input signal, and intercept the output signal for the time length of t to obtain the corresponding sampled voltage and current signals U. (n) and I(n); 步骤3、将获得的输入端和输出端的采样电压、电流信号U(n)和I(n)对应点相乘，得到单个点对应的输入、输出功率，分别记为Pin(n)和Pout(n)；Step 3. Multiply the corresponding points of the obtained sampling voltage and current signals U(n) and I(n) of the input and output terminals to obtain the input and output power corresponding to a single point, which are respectively recorded as P in (n) and P out (n); 步骤4、根据单个点的输入、输出功率Pin(n)和Pout(n)获得Y个周期内的输入、输出功率，表示为：Step 4. Obtain the input and output power in Y cycles according to the input and output power P in (n) and P out (n) of a single point, expressed as:
Figure FDA0002963810880000011
Figure FDA0002963810880000011
 步骤5、根据步骤4得到的输入、输出功率Pin和Pout求得变频器的时域能效为：Step 5. According to the input and output powers P in and P out obtained in step 4, the time-domain energy efficiency of the inverter is obtained as:
Figure FDA0002963810880000012
Figure FDA0002963810880000012
 步骤6、将输入端的采样电压、电流信号U(n)和I(n)运用离散傅里叶变换DFT进行处理，得到基波和各次谐波电压、电流信号的频域分量U(k)、I(k)及相位差θ(k)；Step 6. Use the discrete Fourier transform DFT to process the sampled voltage and current signals U(n) and I(n) at the input terminal to obtain the frequency domain components U(k) of the fundamental wave and each harmonic voltage and current signal. , I(k) and phase difference θ(k); 其中k(k＝1,2,3,…)为谐波次数，则变频器的频域输入功率为：Where k(k=1,2,3,...) is the harmonic order, then the frequency domain input power of the inverter is:
Figure FDA0002963810880000013
Figure FDA0002963810880000013
 步骤7、同理得到变频器的频域输出功率Pout′，并依据步骤5的公式获得变频器的频域能效为η′，记录时域能效η和频域能效η′值，并取Y＝Y+1个周期，重复步骤3-7；Step 7, similarly obtain the frequency domain output power P out ′ of the frequency converter, and obtain the frequency domain energy efficiency of the frequency converter according to the formula in step 5 as η ', record the time domain energy efficiency η and frequency domain energy efficiency η ' values, and take Y =Y+1 cycle, repeat steps 3-7; 步骤8、然后基于某一设定时间节点下对应的时域能效和频域能效值，获得待测变频器的能效。Step 8: Then, based on the corresponding time-domain energy efficiency and frequency-domain energy efficiency values under a certain set time node, obtain the energy efficiency of the frequency converter to be tested. 2.根据权利要求1所述变频器能效的快速测量方法，其特征在于，所述步骤2的过程具体为：2. The fast measuring method of the energy efficiency of the frequency converter according to claim 1, wherein the process of the step 2 is specifically: 对待测变频器的输入端信号进行整周期截断，取周期数为Y(Y＝1,2,3…)，对应的时间窗长度为t；Truncate the whole cycle of the input signal of the inverter to be tested, take the cycle number as Y (Y=1, 2, 3...), and the corresponding time window length as t; 采用数据采集卡对电压信号U和电流信号I进行采样，将模拟量转换成数字量，对输入端信号每周波采样N个点，对输出端信号也进行t时间长度的截取，获得对应的电压、电流信号U(n)和I(n)，其中n(n＝1,2,3,…)为采样点，取周期数Y＝1。The data acquisition card is used to sample the voltage signal U and the current signal I, convert the analog quantity into digital quantity, sample N points per cycle for the input signal, and intercept the output signal for the time length of t to obtain the corresponding voltage , the current signals U(n) and I(n), where n (n=1, 2, 3, . . . ) is the sampling point, and the cycle number Y=1. 3.根据权利要求1所述变频器能效的快速测量方法，其特征在于，在步骤6中，所得到的电压、电流信号的频域分量U(k)、I(k)表示为：3. The fast measuring method of the energy efficiency of the frequency converter according to claim 1, is characterized in that, in step 6, the frequency domain components U(k), I(k) of the obtained voltage and current signals are expressed as:
Figure FDA0002963810880000021
Figure FDA0002963810880000021
 4.根据权利要求1所述变频器能效的快速测量方法，其特征在于，所述步骤8的过程具体为：4. the fast measuring method of the energy efficiency of the frequency converter according to claim 1, is characterized in that, the process of described step 8 is specifically: 首先建立误差函数e(Y)＝|η-η′|和误差阈值ε，ε根据实际测量结果来确定且接近于零，Y为输入端信号周期数；First, establish the error function e(Y)=|η-η′| and the error threshold ε, ε is determined according to the actual measurement results and is close to zero, and Y is the number of signal cycles at the input terminal; 获得误差函数与输入端信号周期数e(Y)-Y关系图，将小于误差阈值ε的极小值点记为Ej(j＝1,2,3…)；Obtain the relationship diagram between the error function and the number of cycles of the input signal e(Y)-Y, and record the minimum point less than the error threshold ε as E j (j=1, 2, 3...); 取E2所对应的时间节点，该时间节点下对应的时域能效和频域能效的平均值即为待测变频器的能效。Take the time node corresponding to E 2 , and the average value of the corresponding time domain energy efficiency and frequency domain energy efficiency under this time node is the energy efficiency of the inverter to be tested. 5.根据权利要求4所述变频器能效的快速测量方法，其特征在于，所述方法还包括：5. The fast measuring method of the energy efficiency of the frequency converter according to claim 4, wherein the method further comprises: 若e(Y)-Y关系图中找不到E2时间节点，则延长采样时间窗长度t，重新进行计算。If the E 2 time node cannot be found in the e(Y)-Y relationship graph, extend the sampling time window length t and recalculate.
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